Transverse mass distributions of neutral pions from 
                $^{208}$
              Pb-induced reactions at 158
                $\cdot A$
               GeV

Aggarwal, M. M.

doi:10.1007/s100520100886

Cited by 89 publications

(41 citation statements)

References 19 publications

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“…The evolution of central R AA with the collision center-of-mass energy, from the SPS [3,4] to RHIC [50,51], and then to the LHC [9][10][11], is presented in Fig. 5.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

“…By comparing high-p T particle yields in AA collisions to predictions of theoretical models, insight into the fundamental properties of the QGP can be gained. Over the years, a number of results have been made available by experiments at SPS [3,4], at RHIC [5][6][7][8], and at the CERN LHC [9][10][11]. The modification of high-p T particle production is typically quantified using the ratio of the charged-particle p T spectrum in AA collisions to that of pp collisions, scaled by the average number of binary nucleon-nucleon collisions, N coll .…”

Section: Introductionmentioning

confidence: 99%

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Charged-particle nuclear modification factors in PbPb and pPb collisions at s N N = 5.02 $$ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5.02 $$ TeV

Khachatryan

Sirunyan

Tumasyan

et al. 2017

J. High Energ. Phys.

166

123

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The spectra of charged particles produced within the pseudorapidity window |η| < 1 at √ s NN = 5.02 TeV are measured using 404 µb −1 of PbPb and 27.4 pb −1 of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < p T < 400 GeV in pp and 0.7 < p T < 400 GeV in PbPb collisions. The corresponding nuclear modification factor, R AA , is measured in bins of collision centrality. The R AA in the 5% most central collisions shows a maximal suppression by a factor of 7-8 in the p T region of 6-9 GeV. This dip is followed by an increase, which continues up to the highest p T measured, and approaches unity in the vicinity of p T = 200 GeV. The R AA is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS collaboration to construct the pPb nuclear modification factor, R pA , up to 120 GeV. For p T > 20 GeV, R pA exhibits weak momentum dependence and shows a moderate enhancement above unity. The CMS collaboration 241 IntroductionThe charged-particle transverse momentum (p T ) spectrum is an important tool for studying parton energy loss in the dense QCD medium, known as the quark gluon plasma (QGP), that is produced in high energy nucleus-nucleus (AA) collisions [1,2]. In such collisions, high-p T particles, which originate from parton fragmentation, are sensitive to the amount of energy loss that the partons experience traversing the medium. By comparing highp T particle yields in AA collisions to predictions of theoretical models, insight into the fundamental properties of the QGP can be gained. Over the years, a number of results have been made available by experiments at SPS [3,4], at RHIC [5][6][7][8], and at the CERN LHC [9][10][11]. The modification of high-p T particle production is typically quantified using the ratio of the charged-particle p T spectrum in AA collisions to that of pp collisions, scaled by the average number of binary nucleon-nucleon collisions, N coll . This quantity is known as the nuclear modification factor, R AA , and can also be formulated as function of p T as R AA (p T ) = dN AA /dp T N coll dN pp /dp T = dN AA /dp T T AA dσ pp /dp T , ( 1) where N AA and N pp are the charged-particle yields in AA collisions and pp collisions, and σ pp is the charged-particle cross section in pp collisions. The ratio of N coll with the total inelastic pp cross section, defined as T AA = N coll /σ pp inel , is known as the nuclear overlap function and can be calculated from a Glauber model of the nuclear collision geometry [12]. In this work we adopt natural units, such that c = 1.-1 - JHEP04(2017)039The factor of 5 suppression observed in the R AA of charged hadrons and neutral pions at RHIC [5][6][7][8] was an indication of strong medium effects on particle production in the final state. However, the RHIC measurements were limited to a p T range below 25 GeV and a collision energy...

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“…The evolution of central R AA with the collision center-of-mass energy, from the SPS [3,4] to RHIC [50,51], and then to the LHC [9][10][11], is presented in Fig. 5.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Charged-particle nuclear modification factors in PbPb and pPb collisions at s N N = 5.02 $$ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5.02 $$ TeV

Khachatryan

Sirunyan

Tumasyan

et al. 2017

J. High Energ. Phys.

166

123

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“…These findings are derived from the observation of elliptic flow [12][13][14][15][16], electromagnetic spectra [17,18], quarkonium melting [19][20][21][22][23][24][25][26], enhanced strangeness production [27][28][29][30][31][32] and jet quenching [33][34][35][36][37][38][39][40][41][42][43][44]; for a very recent review, see ref. [45].…”

Section: Introductionmentioning

confidence: 99%

Exceptional thermodynamics: the equation of state of G2 gauge theory

Bruno

Caselle

Panero

et al. 2015

J. High Energ. Phys.

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We present a lattice study of the equation of state in Yang-Mills theory based on the exceptional G 2 gauge group. As is well-known, at zero temperature this theory shares many qualitative features with real-world QCD, including the absence of colored states in the spectrum and dynamical string breaking at large distances. In agreement with previous works, we show that at finite temperature this theory features a first-order deconfining phase transition, whose nature can be studied by a semi-classical computation. We also show that the equilibrium thermodynamic observables in the deconfined phase bear striking quantitative similarities with those found in SU(N ) gauge theories: in particular, these quantities exhibit nearly perfect proportionality to the number of gluon degrees of freedom, and the trace anomaly reveals a characteristic quadratic dependence on the temperature, also observed in SU(N ) Yang-Mills theories (both in four and in three spacetime dimensions). We compare our lattice data with analytical predictions from effective models, and discuss their implications for the deconfinement mechanism and high-temperature properties of strongly interacting, non-supersymmetric gauge theories. Our results give strong evidence for the conjecture that the thermal deconfining transition is governed by a universal mechanism, common to all simple gauge groups.

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“…The nuclear modification factor of charged particles for SPS, RHIC and LHC is shown in Fig. 1-left [45][46][47][48][49][50]. The LHC measurements show a slightly stronger suppression than those from RHIC [42,43]; the largest measured suppression, in the p T range 6-9 GeV/c, is at the LHC a factor of about 7, while at RHIC a factor of 5 was observed.…”

Section: High P T Particlesmentioning

confidence: 99%

“…At the LHC, the nuclear suppression factor is also studied with identified particles, which further constrains theoretical models of energy loss. For light-flavoured particles, π, K, p, at low p T , a mass ordering related to radial for neutral pions (π 0 ), charged hadrons (h ± ), and charged particles [45][46][47][48][49][50], compared to several theoretical predictions (for references see [45]). is visible.…”

Section: High P T Particlesmentioning

confidence: 99%

An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: Hard probes

Foka

Janik

2016

Reviews in Physics

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The first collisions of lead nuclei, delivered by the CERN Large Hadron Collider (LHC) at the end of 2010, at a centreof-mass energy per nucleon pair √ s NN = 2.76 TeV, marked the beginning of a new era in ultra-relativistic heavy-ion physics. The study of the properties of the produced hot and dense strongly-interacting matter at these unprecedented energies is currently experimentally pursued by all four big LHC experiments, ALICE, ATLAS, CMS, and LHCb. The more than a factor 10 increase of collision energy at LHC, relative to the previously achieved maximal energy at other collider facilities, results in an increase of production rates of hard probes. This review presents selected experimental results focusing on observables probing hard processes in heavy-ion collisions delivered during the first three years of the LHC operation. It also presents the first results from Run 2 heavy-ion data at the highest energy, as well as from the studies of the reference pp and p-Pb systems, which are an integral part of the heavy-ion programme. (Małgorzata Anna Janik) 1 In fact, it is a pseudo-critical temperature as 'lattice QCD' calculations indicate a crossover rather than a well defined phase transition [2,3].

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Transverse mass distributions of neutral pions from $^{208}$ Pb-induced reactions at 158 $\cdot A$ GeV

Cited by 89 publications

References 19 publications

Charged-particle nuclear modification factors in PbPb and pPb collisions at s N N = 5.02 $$ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5.02 $$ TeV

Charged-particle nuclear modification factors in PbPb and pPb collisions at s N N = 5.02 $$ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5.02 $$ TeV

Exceptional thermodynamics: the equation of state of G2 gauge theory

An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: Hard probes

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